ACL Injury Symptoms and Treatment Options
Dr. Charles Chu Santos MD, FPOA | July 01, 2026
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Key Takeaways
- ACL injuries often occur during sports involving sudden stops, pivoting, or jumping.
- A popping sound, rapid swelling, or knee instability may indicate an ACL tear.
- Early diagnosis with a physical exam and MRI helps guide the right treatment.
- Treatment may include rehabilitation, bracing, or arthroscopic ACL reconstruction.
- Prompt orthopedic care can help restore knee stability and reduce the risk of further injury.
Introduction
An ACL (anterior cruciate ligament) injury is one of the most common and serious knee injuries, especially among athletes and physically active individuals. The ACL plays a critical role in stabilizing the knee during activities such as running, jumping, pivoting, and sudden changes in direction. When this ligament is injured, it can significantly affect mobility, athletic performance, and everyday activities.
ACL injuries frequently occur during sports like basketball, volleyball, football, soccer, and badminton, but they can also result from falls, accidents, or awkward landings. While some people can still walk after an ACL tear, continuing activity without proper evaluation may worsen the injury or lead to additional damage to the meniscus or cartilage.
If you experience a sudden knee injury accompanied by swelling, instability, or a popping sensation, early diagnosis is essential. Prompt evaluation by an orthopedic specialist can help determine the severity of the injury and identify the most appropriate ACL injury treatment in Cebu, whether through rehabilitation or surgery.
Understanding ACL Injuries
The anterior cruciate ligament (ACL) is one of the four major ligaments of the knee. It connects the thigh bone (femur) to the shin bone (tibia) and helps keep the knee stable during movement.
The ACL prevents the tibia from sliding too far forward and controls rotational movements of the knee, making it especially important during sports that involve cutting, pivoting, and jumping.
ACL injuries may be classified as:
Partial ACL Tear
A partial tear occurs when only some of the ligament fibers are damaged. Depending on knee stability and activity level, some patients may recover without surgery through rehabilitation.
Complete ACL Tear
A complete tear means the ligament has been fully disrupted. This often results in significant knee instability and is more likely to require surgical reconstruction, particularly for active individuals.
Common situations that cause ACL injuries include:
- Sudden stops while running
- Rapid changes in direction
- Twisting the knee while the foot is planted
- Landing awkwardly after a jump
- Direct impact during sports or accidents
Common Causes and Risk Factors
High-Impact Sports
ACL injuries commonly occur in sports that involve frequent jumping, pivoting, and rapid acceleration or deceleration, including:
- Basketball
- Volleyball
- Football
- Soccer
- Badminton
Many athletes who sustain these injuries benefit from specialized Sports Medicine and Arthroscopic Surgery, which focuses on diagnosing and treating sports-related joint injuries using advanced, minimally invasive techniques.
Sudden Twisting or Pivoting Movements
Rapid directional changes place significant stress on the ACL and are among the leading causes of ligament tears.
Poor Conditioning or Muscle Imbalance
Weak core muscles, poor hamstring strength, or inadequate neuromuscular control may increase the risk of ACL injuries.
Previous Knee Injuries
Individuals with prior ligament injuries, meniscus tears, or knee surgeries may be at greater risk for future ACL injuries.
Inadequate Warm-Up or Training Technique
Improper warm-up routines, poor landing mechanics, and incorrect sports techniques can contribute to ACL injuries.
Symptoms of an ACL Injury
Recognizing the symptoms early can help prevent additional damage to the knee.
A Sudden “Pop” at the Time of Injury
Many patients describe hearing or feeling a distinct popping sensation when the ACL tears.
Immediate Swelling
Swelling often develops within a few hours due to bleeding inside the knee joint.
Severe Pain and Instability
Pain may be intense immediately after the injury, although it sometimes decreases after several hours. However, many patients continue to experience knee instability.
Difficulty Walking or Bearing Weight
Walking may become difficult because the knee feels unstable or painful.
The Knee “Giving Way”
A feeling that the knee suddenly buckles or gives out during movement is one of the hallmark signs of an ACL injury.
If you experience these symptoms, it is important to seek prompt orthopedic evaluation to prevent further injury.
How ACL Injuries Are Diagnosed
Early diagnosis allows appropriate treatment planning and helps reduce the risk of long-term knee problems.
Physical Examination
Your orthopedic specialist will perform specific tests to assess knee stability, including:
- Lachman Test
- Pivot Shift Test
- Anterior Drawer Test
These examinations help determine whether the ACL has been injured.
MRI Scan
An MRI provides detailed images of the ACL, cartilage, meniscus, and surrounding soft tissues.
MRI is considered the best imaging study for confirming ACL tears and evaluating whether additional injuries are present.
Assessment for Associated Injuries
Many ACL tears occur together with:
- Meniscus tears
- Cartilage injuries
- Bone bruises
- Other ligament injuries
A comprehensive evaluation ensures that all damaged structures are identified before treatment begins.
Treatment Options for ACL Injuries
Treatment depends on the severity of the injury, your age, activity level, occupation, and lifestyle goals.
Non-Surgical Treatment
Not every ACL injury requires surgery.
Patients with partial tears or lower physical demands may benefit from:
- Physical therapy
- Strengthening exercises
- Knee bracing
- Activity modification
The primary goal is to restore strength, stability, and confidence while reducing the risk of future injuries.
ACL Reconstruction Surgery
For complete ACL tears or patients who wish to return to sports or physically demanding activities, surgery is often recommended.
Many patients undergoing ACL injury treatment in Cebu choose Sports Medicine and Arthroscopic Surgery, where ACL reconstruction is commonly performed using minimally invasive arthroscopic techniques.
Graft Options
The new ACL may be reconstructed using:
- Autograft (the patient’s own tendon)
- Allograft (donor tendon)
Your orthopedic surgeon will recommend the most appropriate option based on your individual needs.
Arthroscopic ACL Reconstruction
ACL reconstruction is usually performed using arthroscopic surgery, which utilizes small incisions and specialized instruments to reconstruct the damaged ligament.
This procedure is commonly offered as part of Shoulder, Hip and Knee Surgery services for patients with significant ligament injuries.
Rehabilitation After Treatment
Whether treated surgically or non-surgically, rehabilitation is essential.
A structured physiotherapy program helps restore:
- Range of motion
- Strength
- Balance
- Knee stability
- Functional movement
Recovery Expectations
Recovery varies depending on treatment and individual patient factors.
Non-Surgical Recovery
Patients treated conservatively often recover over several months through rehabilitation and strengthening exercises.
Recovery After ACL Reconstruction
Recovery after surgery typically follows a structured rehabilitation program.
Many athletes require approximately 6 to 9 months before returning to competitive sports, although timelines vary.
Return to Sports
Returning too early increases the risk of re-injury.
Orthopedic specialists usually recommend objective strength and functional testing before clearance for sports participation.
Importance of Physiotherapy
Patients who consistently follow rehabilitation programs often experience better long-term outcomes and improved knee function.
When Should You See an Orthopedic Doctor?
Seek medical attention promptly if you experience:
1. Immediate Swelling After a Knee Injury
Rapid swelling following a twisting injury may indicate an ACL tear or another significant knee injury.
2. Inability to Continue Sports
If you cannot continue playing because your knee feels unstable or painful, an orthopedic evaluation is recommended.
3. Persistent Knee Instability
Repeated episodes of the knee giving way should never be ignored.
4. Pain That Does Not Improve
Persistent pain despite rest, ice, and activity modification warrants further evaluation.
Early diagnosis can help prevent long-term knee instability and reduce the risk of developing additional knee injuries.
Frequently Asked Questions
Partial ACL tears may respond well to rehabilitation. However, complete ACL tears generally do not heal on their own because the ligament has limited healing capacity.
Many patients can walk within days to weeks after injury, depending on severity. Full recovery depends on whether treatment is surgical or non-surgical.
Many patients successfully return to sports after completing rehabilitation and meeting functional recovery goals. Returning too early may increase the risk of re-injury.
Modern arthroscopic ACL reconstruction is performed under anesthesia, and postoperative pain is managed with medications and rehabilitation. Most patients gradually become more comfortable as recovery progresses.
Untreated ACL injuries can lead to chronic knee instability, repeated episodes of the knee giving way, meniscus tears, cartilage damage, and an increased risk of developing early osteoarthritis.
Dr. Chu Santos' Advice
“Many patients continue walking after an ACL injury because the pain may gradually decrease. However, persistent knee instability or repeated episodes of the knee giving way can lead to additional damage to the meniscus and cartilage. Early orthopedic evaluation allows us to diagnose the injury accurately and recommend the most appropriate treatment, helping you return to your daily activities or sports safely.”
– Dr. Charles Andrew Chu Santos MD, FPOA
Ready to Take the Next Step?
If you suspect an ACL injury, don’t wait for your symptoms to worsen.
Related Orthopedic Services
You may also find our guide on When Should You See an Orthopedic Doctor for Knee Pain? helpful if you are experiencing ongoing knee discomfort or instability.
Ready to Take the Next Step?
If you suspect an ACL injury, don’t wait for your symptoms to worsen.
Dr. Charles Andrew Chu Santos MD, FPOA
Need an appointment or have questions? Get in touch with Dr. Charles Andrew Chu Santos and visit the clinic during operating hours. Your orthopedic health is our priority.
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